CN1075373A - Modulation transmission technology of pulse width signal - Google Patents
Modulation transmission technology of pulse width signal Download PDFInfo
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- CN1075373A CN1075373A CN 92108208 CN92108208A CN1075373A CN 1075373 A CN1075373 A CN 1075373A CN 92108208 CN92108208 CN 92108208 CN 92108208 A CN92108208 A CN 92108208A CN 1075373 A CN1075373 A CN 1075373A
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- pulse width
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- 230000005540 biological transmission Effects 0.000 title abstract description 8
- 238000012546 transfer Methods 0.000 claims description 3
- 230000008054 signal transmission Effects 0.000 claims 1
- 238000005096 rolling process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 230000011664 signaling Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
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Abstract
The invention relates to a modulation transmission technology of a pulse width signal of a mouth bar pulse signal by using n +1 signal channels on the basis of transmitting n +1 pulse width signals. The infrared axle temperature detector (HZT-1B) is used for a railway infrared axle temperature detector, can transmit axle box rolling/sliding information on the basis of transmitting axle temperature information, has the characteristics of simple added circuit and low investment, and enables railway workers to accurately judge overheated axle boxes so as to check and process in time, thereby improving the safety degree and economic benefit of railway transportation.
Description
The invention relates to the technology that the pulse-width signal carries out modulation transmissions, particularly be used for checking the modulation-transmission technology that is used to transmit axle temperature signal and rail vehicle axle box model (roll/slide) signal in the infrared axle temperature detector of running train axle for vehicle oven temperature, degree.
As everyone knows, infrared axle temperature detector (HZT-1B) is mainly by magnetic inductor, and infrared probe sends terminal and receiving end machine and forms.When running train passes through sensing point, the infrared probe that is installed in the railway both sides detects the axle temperature information of vehicle both sides axle box-temperature variant voltage amplitude signal respectively, then by two voltage amplitude-time changes (V/T) circuit, the technology of using is that this two voltage signal is transformed to two pulse width signals respectively now, and add the rebasing pulse of the preceding paragraph, respectively two oscillators are carried out frequency shift keying with this two-way pulse width signal then, promptly to high/low voltage, the generation amplitude is identical, and frequency is respectively f
Pass I(or f
Pass II) and f
Empty I(or f
Empty II) frequency-shift signaling, by the circuit dish two frequency-shift signalings are mixed sending to outside line after amplifying again.Receiving the terminal part, the signal that outside line is sent here separates the two-way frequency-shift signaling through bandpass filter, by inhaling demodulator circuit frequently, every road frequency-shift signaling is reduced into pulse width signal, be reduced into the voltage amplitude signal by integrating circuit after cutting out rebasing signal, promote Test pencil with magnet work then after power amplification, axletree left and right sides axle box temperature signal is recorded on the paper successively, whole axle temperature signal Processing and transmission course sequential chart are as shown in Figure 1.Because existing axle box is two types of roll/slide, and these two kinds of axle boxes Changing Pattern in train operation is different, like this under the situation of not knowing axle box roll/slide information, just be difficult to declare exactly and appear hot axle box, so that notify the maintainer to check processing according to the axle temperature information that writes down on the paper.
The objective of the invention is to design the modulation-transmission technology of a kind of use n+1 road pulse width signal channel transfer n+1 road pulse width signal and n road pulse (pulse width) signal, the particularly a kind of two-way frequency-shift signaling channel transfer two-way pulse width signal (axle temperature information) of existing infrared axle temperature detector and modulation-transmission technology of one road pulse signal (information is rolled/slided in expression) of using.
Technical solution of the present invention as shown in Figure 2, sending terminal part (a 1) increase rolling identification signal generation modulation circuit (3), this circuit rolls/slides the pulse signal of identification signal to roll/slide generation one expression of every pair of axle box, on the basis that does not influence axle temperature information, the skid identification signal that produces is modulated in the pulse width signal of a certain road, even initial the hysteresis along look ahead system of the positive pulse of pulse width signal represented skid information, another road pulse width signal then remains unchanged, so that keep positive pulse start time information and for information about.And increase skid identification signal demodulator circuit (4) in receiving end (2) part, by the initial comparison of two-way pulse width signal along the position, demodulate the skid identification signal, and recover to contain the expression axle temperature signal of skid information one tunnel, pulse width signal is recorded in position corresponding on the paper tape by necessary processing with two-way axle temperature signal and No. one axle box type signal again.
Above-mentioned technical solution can also be promoted the situation that n+1 road pulse width is transmitted, if n pulse width signal is wherein modulated with other n road pulse (pulse width) signal, promptly, represent the pulse width of modulation signal with leading amount formula hysteresis with the high/low level of the leading of the initial edge of pulse width signal or the expression modulation signal that lags behind.And a road not modulated pulse width signal has kept the initial along signal of modulated signals.Or the comparison of lag behind (in advance amount or hysteresis) leading by the modulated pulse width signal in n road and the initial edge of not modulated pulse width signal at receiving end, can demodulate the pulse (pulse width signal) of modulating, and recover modulated pulse width signal.
The advantage of the modulation technique of pulse width signal of the present invention is: saves signalling channel, promptly uses the n+1 paths on the basis of transmission n+1 road pulse width signal, but additional transmissions n road pulse (pulse width) signal.Be applied in the infrared axle temperature detector, can transmit axle box roll/slide information on the basis of transmitting two paths axle temperature signal, information can be judged accurately to crossing hot axle box in view of the above.The present invention can be used in the transmission of pulse width signal, in railroad train vehicle shaft temperature monitoring system, improves safety of railway transportation degree and economic benefit.
Below in conjunction with accompanying drawing embodiments of the invention are described in further detail.
Fig. 1 is the signal timing diagram that adopts the infrared axle temperature detector of prior art.
Fig. 2 is a schematic diagram of the present invention, and 1 for sending terminal among the figure; 2 for receiving terminal; 3 is skid identification signal generation modulation circuit; 4 is skid identification signal demodulator circuit.
Fig. 3 is an embodiment of the invention circuit theory diagrams.
Fig. 4 is a signal timing diagram embodiment illustrated in fig. 3.
By Fig. 2, Fig. 3 as can be known, this embodiment is used for the infrared bobbin detector that shakes with the present invention, promptly on the basis of transmitting two paths axle temperature signal, transmit the skid identification signal, therefore in partial circuit and its effect of receiving terminal and the increase of transmission terminal be respectively: the skid identification circuit is given birth to a high level pulse, monostable D for axle box skid movable property
1Effect is anti-stick time-delay, bistable B
2For resetting B
1Be identification signal modulation, B
3Be the cutting of I road, B4 is skid identification, B
5Be zero clearing, D
6Be the cutting of II road, D
7For identification resets.Transducer V/T II is output as common pulse width signal, the V/T I has been then for having modulated the pulse width signal of skid identification signal, and as seen leading when axle box its high flat initial edge of rolling, promptly rebasing signal broadens, its high level was initial along lagging behind when axle box slided, and promptly rebasing signal narrows down.At receiving unit, demodulate the skid identification signal by d type flip flop, promote the Test pencil with magnet record through power amplifier, and in pulse width signal, cut out corresponding rebasing signal, recover original axle temperature signal, and be recorded on the paper tape by Test pencil with magnet.
Claims (2)
1, a kind of modulation-transmission technology with pulse width signal of n+1 bar pulse width signal transmission channel, it is characterized in that wherein n bar channel transfer pulse width signal is as modulated signals, modulate as modulation signal by an other n pulse (pulse width) signal, the height of promptly representing modulation signal with the leading or hysteresis on the high flat initial edge of modulated signals, low level, and the pulse width of representing modulation signal with the size of leading amount (hysteresis), and compare at receiving end n bar modulated signals and 1 not modulated signal, demodulate n bar modulation signal respectively and recover n bar modulated signals.
2, by the described modulation-transmission technology of claim 1, it is characterized in that modulated signals is a road pulse width signal in the two-way of expression axle temperature signal in the infrared axle temperature detector, modulation signal is to be the positive level pulse when axle box rolls, one road pulse signal of expression skid information is modulated one road pulse width signal wherein, leading expression with the initial edge of modulated signals has the positive level pulse, lagging behind does not then have, receiving end relatively demodulating the skid identification signal and recovering modulated axle temperature signal by initial edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92108208 CN1075373A (en) | 1992-07-17 | 1992-07-17 | Modulation transmission technology of pulse width signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92108208 CN1075373A (en) | 1992-07-17 | 1992-07-17 | Modulation transmission technology of pulse width signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1075373A true CN1075373A (en) | 1993-08-18 |
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ID=4943330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92108208 Pending CN1075373A (en) | 1992-07-17 | 1992-07-17 | Modulation transmission technology of pulse width signal |
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| CN (1) | CN1075373A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101537848B (en) * | 2008-03-19 | 2013-06-19 | 阿尔斯通运输股份有限公司 | Threshold-based safety circuit for a railway system |
| CN106888005A (en) * | 2015-12-15 | 2017-06-23 | 西安富成防务科技有限公司 | A kind of TACAN pulsing signal recognition devices |
-
1992
- 1992-07-17 CN CN 92108208 patent/CN1075373A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101537848B (en) * | 2008-03-19 | 2013-06-19 | 阿尔斯通运输股份有限公司 | Threshold-based safety circuit for a railway system |
| CN106888005A (en) * | 2015-12-15 | 2017-06-23 | 西安富成防务科技有限公司 | A kind of TACAN pulsing signal recognition devices |
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